Fair Value Measurement - Measurement Inputs (Details) - Valuation Technique, Discounted Cash Flow - Fair Value, Inputs, Level 3	Mar. 31, 2022	Dec. 31, 2021
Minimum | Discount rate | Loans (at fair value)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable, measurement input	4.68%	3.42%
Minimum | Discount rate | Notes Receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable, measurement input	4.47%	4.96%
Minimum | Credit risk rate | Loans (at fair value)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable, measurement input	0.01%	0.08%
Minimum | Credit risk rate | Notes Receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable, measurement input	0.04%	0.04%
Minimum | Prepayment rate | Loans (at fair value)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable, measurement input	5.75%	8.70%
Minimum | Prepayment rate | Notes Receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable, measurement input	15.60%	15.60%
Maximum | Discount rate | Loans (at fair value)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable, measurement input	16.95%	16.49%
Maximum | Discount rate | Notes Receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable, measurement input	16.17%	15.72%
Maximum | Credit risk rate | Loans (at fair value)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable, measurement input	79.09%	55.79%
Maximum | Credit risk rate | Notes Receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable, measurement input	50.69%	50.69%
Maximum | Prepayment rate | Loans (at fair value)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable, measurement input	91.56%	88.12%
Maximum | Prepayment rate | Notes Receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable, measurement input	36.08%	36.08%
Weighted Average | Discount rate | Loans (at fair value)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable, measurement input	7.53%	7.29%
Weighted Average | Discount rate | Notes Receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable, measurement input	7.40%	6.78%
Weighted Average | Credit risk rate | Loans (at fair value)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable, measurement input	14.65%	17.98%
Weighted Average | Credit risk rate | Notes Receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable, measurement input	18.52%	18.47%
Weighted Average | Prepayment rate | Loans (at fair value)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable, measurement input	41.49%	40.35%
Weighted Average | Prepayment rate | Notes Receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan receivable, measurement input	27.77%	27.82%